<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th>
            <input type="checkbox" @isAll="isAllFn" v-model="isAll" />
            <span>全选</span>
          </th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <WorkOne
          v-for="(item, index) in goodList"
          :key="index"
          :name="item.name"
          :price="item.price"
          :num="item.num"
          :index="index"
          :checked="item.checked"
          :list="goodList"
          @del="del"
          @Add="addFn"
          @jianshao="jianshao"
        >
        </WorkOne>
      </tbody>
      <tfoot>
        <tr>
          <td>合计:</td>
          <td colspan="5"></td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
import WorkOne from './components/WorkOne.vue'
export default {
  computed: {
    isAll: {
      // 获取
      get() {
        // 函数返回值    检查数组里每一个item的checked属性是否都为true
        return this.goodList.every((item) => item.checked === true)
      },
      set(val) {
        // 按顺序为数组中的每个元素调用一次函数。
        console.log(val)
        // 此时val的值是点击后的checked值       false     true
        //遍历每个函数 给他们都执行一次代码  让他们的checked值都变成点击后的val值 也就是false或者true
        this.goodList.forEach((item) => (item.checked = val))
      },
    },
  },
  methods: {
    del(index) {
      this.goodList.splice(index, 1)
    },
    addFn(index, p) {
      this.goodList[index].num = this.goodList[index].num + p
    },
    jianshao(index, p) {
      this.goodList[index].num = this.goodList[index].num - p
    },
    //
    isAllFn(val) {
      console.log(val)
      this.checked = val
    },
  },
  components: {
    WorkOne,
  },
  data() {
    return {
      goodList: [
        {
          name: '诸葛亮',
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: '蔡文姬',
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: '妲己',
          price: 2000,
          num: 1,
          checked: false,
        },
        {
          name: '鲁班',
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
    }
  },
}
</script>

<style></style>
